Means for balancing centrifugal pumps.



110.941,641. PATENTBD 11111.15, 1907.

J. DEGEN.

MEANS POR BALANGING CENTRIFUGAL PUMPS.

APPLICATION FILED JUNE 29. 1905.

7 SHEETS-SHEET 1 PATENTED JAN. 15E, 1907.

J. DEGEN. MEANS POR BALANCING CBNTRIFUGAL PUMPS..

APPLICATION THIRD JUNE 29.71905,

'7 SHEETS-SHEET 2.

r im m I P ATBNTED JAN. 15, 1907. J. DEGEN. 1 MEANS P011 BALANCINGGBNTRIPUGAL PUMPS.

fAPPLIGATIGN FILED JUN 29. i905.

7 SHEETS-SHEET 3.

No. 841,641. PATENTED JAN. 15, 1907.

J. DBGBN.

MEANS FOR BALANCING CBNTRIFUGAL PUMPS.

APPLICATION FILED 111111: 29, 1905. l

7 SHEETS-SHEET 4. f

flaw/afar:

N0. 841',641. PATENTED JAN. 15, 1907.

J. DEGEN.

.MEANS FOR vBALANCING GENIRIFUGAL PMPS.

ARPLIGATION FILED JUNE 29. '1905.

7 SHEETS-SHEET 5.

J. DBGEN. MEANS POR BALANQING UBNTRIPUGAL PUMPS.

APPLICATION FILED JUNE 29. 1905.

PATENTED JAN. 15. 1907.

7 SHEETS-SHEET 6.

mw f f77 nniTnn 4sTATns 'IAaTnNT onirica.

JULiUs DEGTN, or TRENTON, new JERSEY, AssiGNoR, BY MESNE or TaENToN,

MEANS Fon cat Anlcuue CENTRIFUGAL PUMPS.

Specification of Letters IEai'leIlt.v

Patented Jan. 15, 1907.

Application filed JunaZQ, 1905.A Serial No. 267.497.

To all whom it may ooncerm- Be it -known that I, JULIUs DEGEN, a citizenof the Republic of Switzerland, residing in Trenton, in the county of4Mercer and State of New Jersey, have invented certain new and usefulImprovements in Means for Balancing Centrifugal Pumps, ofiwhich thefollowing is a specification, reference being had to the accompanyingdrawings, in which are illustrated one embodiment of my invenf tion.

Figure 1 is a, vertical longitudinal sectional view of a pump embodyingmy invention. Fig. 2 is a plan view thereof. Fig. 3 is an end elevationof the pump, a portion of thel casino' being removed. Fig. 4 is asection of a caring. Fig. 5 is an end view of the suction end of thepump. Fig. 6 is a longitudinal sectional view of the means for securingan impeller to .the shaft and of pacln'ng the shaft where it passesthrough a partition. Fig. 7 is 'an end elevation of the said means forsecuring the impeller to the shaft. Fig. S is a sectional view showingmeans for packing the shaft where it passes through the casing. Fig. 9is a perspective view ofthe sleeve for securing the impeller to theshaft. Fig. 10 is a transverse scctional view of another embodiment ofmy invention; and Fig. 11 is a side view of Fig. 10,

a portion of the casing being removed.

The object of my invention has been to provide a centrifugal pump havingmeans for automatically balancing` the end thrust of the inipeller-shaftand overcoming such end thrust, so that the /shaft shall run freethatis, without being held in place axially by any other means than pressureof the fiuid on either side of the impellers, whereby the friction ofthrust-bearings or their l equivalents may be eliminated--and to suchends my invention -consists in the means Jfor balancing centrifugalpumps hereinafter specified. y

In carrying my invention into practice in that embodiment which isillustrated in Figs. 1 to 9, inclusive, I provide a pump which is or maybe in all respects other than those hereinafter mentioned the same asthat illustrated in the patent granted to me March 13, 1906, No.814,902. The casing 15 is provided with bea-rings 16, in which runs ashaft 17, that carries impellers 18. Each impeller i has a front andrear ring 19 and 120, respectively, having a running fit with thecasing, whereby the Water entering the pump is prevented from reachingthe sides of the im' eller and whereby a chamber 21 is forme at the backof the ilnpellers. is in communication with the water on the entranceside of the impelle'r through a slot 22, formed in the sleeve whichsecures the impeller to the shaft, and therebyT the static ressure atthe entrance 23 ofl the'impeller is balanced bythe static pressurewithin the chamber 21, since the rings 19 and 20 are of the' samediameter. The impeller is rovided with f'ront and rear flanges 24 an 25,that form a-running it with fianges formed on the casing, whereby frontand rear chambers 26 and 27respectively, are formed at the sides of theimpeller outside or beyond the peripheries of the rings 19 and 20. TheWater seeks to pass from theeXit 28 of the impeller through the chamber26 down into the suction-pipe of the casing, because the pressure insuch suction-pi e is lower than at the exit of the impeller. n order tobalance the end thrust formed by the dynamic pressure. of the water bystriking the entrance 23 of the impeller and striking the surface 29that defiects it outward, I cause a reduction of the pressure either inthe chamber 26 or in the chamber 27 until the iinpeller is perfectlybalanced. This reduction is caused by the I jet of water issuing fromthe impeller and passing between the converging walls 30 and 31, leadingto the passage-way to the next impeller. By controlling the sizeof thepassages 32 and 33, formed between the mouth 'of the impeller and thewalls 30 and 31, I am able to control the said suction, as described inthe said patent. In order todo this 'in the present invention annularchambers 34 and 35 are formed outside of the flanges 24 and The chamber21 25 and comn'iunicating with the passages 32 and 33. The chamber 34communicates by /a port 36 with the chamber 26 upon the op'- posite sideof the impeller, and the chamber 35 communicates by a port 37 with thecham.-

ber 27 on the opposite side of the impellerl therefrom.

Inthe further description of the invention'v 35 will be termed theouterchambers.

IOO

The shaft'is provided with bearings which will permit it being shiftedlongitudinally.

The bearing illustrated in Fig. 4 consists of an outer` ball-race' 38,s'ecured'in the bore in the casing and an inner ball-race '39, heldagainsta' shoulder on theshaft by lock-nuts 40and41.--

In the operation of the embodiment of my invention illustrated Figs. 1to Q the lIO pumpvbeing in motion the jet of water issuing from theimpeller will carryalon thewater at its sides, andl the rotation of teim eller will cause the water adhering to 4its si es4v in the chambers34' and 35 to be thrown with the jet issuing from the im eller, wherebya su c` tion will be created in t e said chambers, and

right., as seen in h ig. 1, the exitfrom `the passage 35 will 'bedecreased in Width and 'the' -suctionin thesaid chamber will'beincreased',

l but as the chamber 35 is in communication with the'chamber 27 throughthe bore, 37 this' endwise movement of the impeller will cause adecrease .of .the pressure in the chamber 27', and thereby correct itsown error. other hand, the pressure in the chamber 26 is sufficientlygreatto forcethe impeller to the left in conjunction with the force ofthe Water flowing into the impeller, thenthe passage 32 will bedecreased and the suction in the chamber 34'will beuincreased, causin areduction of pressure in the chamber 26,t ereby again 4correcting andeliminating the end thrust.`

It will be seen, therefore, thatin whatever direction there may be atendency for the impeller to shift axially outside of its balancedposition, or that position Where it runs balanced within the pump,anopposite, force will be created whichit'ends to lead the impeller to abalanced position. I thus maintain the 'pump in a balanced positionautomatically y the action ofthe water aloneand not only eliminate theend thrust andautomatically balance the pump, butdo so without theaddition of any mechanical part.

In Figs. 10 and 11 is illustrated the application of my invention to asingle.- stage pump, theprinciple, however, being essentially the same.There is the casing 42, having bearings for the..shaft 43, carrying the.impeller 44. The impellerv hasth`e inner rings 45 and 46 and the outerrings 47 and 48, forming a chamber '49 at the center of the baclrcf theimpeller and front a'nd rear inner chambers 50 and 51 along thefaces ofthe impeller.1 f The chamber 49 communicates with theysuption side ofthe impeller by a asf .anced The'walls 53 and 54 ybeside the mouth ofthe impellerconverge, as before, so

claiml v l. In a centrifugal pump, thecombination pellercreates asuction'in annular chambers. 55 and 56 at .each side of the. n iouthl ofthe'. The outer chambr 55 `communi-k impeller. cates'by a passage 57with thefijnner cham- Y ber 5l, and the outer chamber 56 communi-l catesby a passage 58 with thefinner chamber 50.

the

present-case and the application for the re- -issue of Patent No.814,902, grantedon. my

application for centrifugal pumps, March 13, .1906, are not claimedherein, but are claimed in said reissue application.y

The method which is common to the pres- 1 8o Serial No. 296,584,filedJanuary 18; 1906/, is ynot claimed in the present application, but 1sclaimed inthe said application.

ent casev and to my copending application,

Havingthus described lthis inventionjl ofa casing, a shaft, an impeller,land'connect- .I

edmeans 'operated by the jet issuing from the impeller for automaticallyintroducing and varying a force for balancing and eliminating the endthrust.

2. In a centrifugal pump, of a casing, a shaft, an impeller, inner andouter chambers formed between the impeller and the casing on both sidesof the imf' the combination e'ller,l and'ports connecting theoutercharner of cneside with the inner chamber of the opposite side ofthe impeller.

3. In a centrifugal pump, the combination of a casing, ashaft, animpeller, inner and outer chambers/ formed between the im# between'` the1impeller and the casing for creating a suction in the outer chambers.

IOO

4. ln a centrifugal pump, the combination of a casing, a shaft, animpeller, a .assageway in which the mouth of the impel er runs,

the walls of said passage-way being contractconnected with saidpassage-way, whereby suction is produced in said outer chambers, innerchambers formed between each side of the said impeller vand' the casing,and ports connecting' the outer chamber on one side of the impeller withthe inner chamber on the opposite'sideof the impeller.

. 5. ln a means for balancing the impeller of a centrifugal pump, thecombination with an .impeller and a casing therefor, between the IIO edin the 'direction of flow of the water,'buter chambers on each side, ofthe impeller and two of which are vf-ormed inner chambers the capacityof which" is increasable and decreasable" upon movement, laterally,4ofthe impeller relatively to the' casing., of peripheral chambers formedin the walls of said casing 7 "l The action of the pump is the samejfasthat illustrated-in Figs. 1 to 9. Those features whichrarefcommon vto.

841,641' Y y a and which communicate? with said irst.-

named chamber' through conduit, the latternamed chambers y.beingsubjected to enlarging and decreasing outlets asv the 'impell'er moveslaterally, whereby to'change the sucking' action at the' outlet,andwhereby to chalnge the pressure on either sideof the iine er. p 6. Ina centriugalpump, the combination With means for operating an impeller,said ilnpeller anda casing therefor comprising and` forming chambersWhose capacity is increased and decreased alternately according to the.axial movement of the impeller, means Jfor changing the pressure insaid chambers, and conduits whereby the change of pressure istransmitted from said means to said chambers. y

able according to the movement of the impeller laterally, andconduitsleading Jfrom the mouths of the impeller to said -chamber7`whereby to change the pressure in said chambers.

v JULIUS IDEGFEN.4 Witnesses: FRED. W. BARNoLo, i

JOHN O. SEIFERT.

